Apple Rootstock Advice

Zendog…that IS a interesting thing to ponder. I’m curious about that also. I DO know that it certainly would not behave anything like a seedling planted tree for a number of different reasons.
First, it would not develop the tap root that at least some of the seedling advantages are derived from.
Secondly, being a named and bred cultivar ( no matter it’s breeding method ) it would not have the dominant allele gene expression that a seedling would have.
Lastly (and I’m shooting from the hip on this), I suspect (that’s code for guessing) that the fact that it was established on primary roots of dwarfing nature that it would have the slower less robust feedstock serving as it’s primary delivery system and other roots (at least in the immediate future) serving as auxiliary supply.
I would expect though that those roots would provide more growing pressure than the dwarfing stock it was planted on thereby keeping it in a vegetative state longer than would otherwise be the case.
The anchorage, longevity, water seeking ability, and possibly broad spectrum disease resistance would not be there.